Title :
Color quality inspection and compensation for color LED display modules
Author :
Tsai, Ming-Jong ; Chang, Shu-Huai ; Lee, Chia-Liang ; Chou, Chia-Te
Author_Institution :
Grad. Inst. of Autom. & Control, Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan
Abstract :
The paper presents an automated color inspection and compensation solutions for color LED modules which are main components of a color LED display panel. Initially, a self-developed color optical sensing module and a colorimeter were used to measure the colors of LED pixels. After the color matching functions from the collected data was corrected by least-squares approximation method, the calibrated measured sensing module was applied to inspect the color characteristics of LED modules. And the chrominance and luminance data are well analyzed to perform a white light chrominance correction and luminance uniformity compensation for LED display modules. Some 2R1G1B LED modules (16×16 LEDs) from a local industry were verified in this study. The experimental results from the central 8×8 LEDs show that the average color difference of a target D65 white light with a chrominance of (0.1978, 0.4683) by using a 2R1G1B LED module is about 0.027006 before compensation, but the average color difference can be reduced to 0.003474 after it was compensated by using the proposed method. Meanwhile, the luminance difference was also reduced to less than 3.541%.
Keywords :
LED displays; brightness; calibration; colorimeters; colour displays; compensation; least squares approximations; optical sensors; 2R1G1B LED module; LED pixel color measurement; automated color quality compensation; automated color quality inspection; average color difference; calibrated measured sensing module; color LED display panel module; color matching function; colorimeter; least-square approximation method; luminance difference; luminance uniformity compensation; self-developed color optical sensing module; white light chrominance correction; Brightness; Image color analysis; Light emitting diodes; Machine learning; Matched filters; Sensors; Testing; Color Measurement; Compensated Look Up Table (CLUT); Least-Squares Approximation; Light Emitting Diodes module (LEDs); RGB Color Sensor; White Light Chrominance Correction;
Conference_Titel :
Machine Learning and Cybernetics (ICMLC), 2011 International Conference on
Conference_Location :
Guilin
Print_ISBN :
978-1-4577-0305-8
DOI :
10.1109/ICMLC.2011.6016985